I use the Twenty Eleven theme, and recently the design of my site has started to fray a little around the edges. It seems likely to me that this is the result of some hasty theme tweaks to allow for the inclusion of WordAds. I realise not everyone will see this as a big deal, but I care about the presentation of my blog.

When you reply to a comment, the comment thread moves to the left and outside of the content border. The resulting comment looks fine, it's the act of expanding the form to write the reply that shifts everything around.

Also, on single post pages, the Prev/Next navigation looks like it's a part of the skyscraper ad.

Finally, the theme is responsive and seems to hide the ads at anything but full width. The gaping hole the skyscraper space leaves behind though is not responsive, so the layout breaks quite badly at smaller sizes.

I'm curious to see if I've earned any revenue from these WordAds, because I think opting out of them may be the best solution.

It looks like you've set your Custom Design upgrade to replace entirely the stylesheets of the themes you use. Can you go to Appearance > Custom Design > CSS and see if "Don't use <themename>'s CSS, and replace everything with my own CSS" is checked? If so, pick the other option.